What is the purpose of the defoamer?

Plastic defoamer, also known as plastic defoaming masterbatch, a part of plastic raw materials or recycled plastics often contain a trace amount of water, if not eliminated, will form bubbles or water lines on the surface of the processed products, which will affect the performance and appearance of the products. However, the traditional process of using electric drying machinery to eliminate moisture needs to dry raw materials in advance, resulting in inconvenient production, and there are shortcomings such as low production efficiency, power consumption, deterioration of processing environment, and increased production cost due to prolonging the processing time of products. The birth of plastic defoaming masterbatch (plastic defoamer) plays a pivotal role in the processing of plastic products containing moisture.

However, many factories that process masterbatches do not understand or understand the production, process, formulation and water absorption reaction mechanism of plastic defoaming masterbatch (plastic defoamer). In the processing of plastic products, no plastic defoaming masterbatch (plastic defoamer) is added, and the surface of plastic products feels delicate and oily, not dry and shiny. After adding plastic defoaming masterbatch (plastic defoamer), the delicate and oily feeling is gone, and the surface of the plastic product is dry and coarse, without smooth and smooth gloss.

It consists of its ABS, PS injection molded products, PP, PE brushed film surface, PE blow molding film bags and other plastic products. Oh, this is the most detailed use, you see it yourself, the manufacturer of plastic defoamer has Hubei Hanchuan Shuanghong new material ****, the quality is OK, I used to work in the factory he deserved, if you are interested, you can go and see.

The main function of the defoamer is to eliminate harmful foam in the industrial production process and prevent the foam from affecting the quality of the product.

Mainly suitable for circuit board (PCB) process; Chemical industry; Electroplate; Dyeing; Paper; Medicine; water-based inks; ceramic slitting; cleaning of steel plates; processing of aluminium; Defoaming and foaming inhibition of various sewage treatment and various industrial water systems.

Defoamers, also known as defoamers, are food additives that reduce surface tension during food processing, inhibit foam production or eliminate foam that has already been produced. There are 7 kinds of defoamers licensed for use in China, including emulsified silicone oil, high-carbon alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethyleneglycerol ether, and polydimethylsiloxane.

The defoamer diffuses in the foam, and forms a double-layer film on the foam wall during diffusion, and the surfactant with a stabilizing effect is discharged during the diffusion process, which reduces the tension of the local surface of the foam, destroys the self-healing effect of the foam, and bursts the foam.

The defoamer may enter the foam wall, but only to a limited extent, and together with the blowing agent it forms a mixed monolayer that bursts if the monolayer is not cohesive.

Polysiloxane defoamer.

The representative polysiloxane defoaming mechanisms mainly include the "bridging-spreading" mechanism, the "bridging-dehumidification" mechanism, and the "spreading-liquid entrainment" mechanism. The "bridging-spreading" mechanism is mainly based on the basic point that "the tension of polysiloxane itself is relatively low and it is easy to spread on the liquid film", which emphasizes that the droplets of the defoamer are easy to deform, but this theory cannot explain the difference between polysiloxane alone and polysiloxane and solid ion mixture when used as a defoamer.

Defoamers typically contain hydrophobic precipitation silica dispersed in mineral or silicone oil. In fact, the larger the particle size of the silica used in the defoamer, the easier it is to precipitate, especially in low-viscosity dispersion systems. The addition of hydrophobic fumed silica can completely prevent or significantly reduce this sedimentation process.

The silanol group in fumed silica is like a lot of needles, puncturing the bubbles, so that the small bubbles converge into large bubbles, overflow the system, and achieve the effect of defoaming. In some defoaming systems, hydrophobic fumed silica can also be a silica component with defoaming effect, fumed silica plays a role in thickening and anti-settling in defoamers, and more importantly, enhancing defoaming ability and improving foam inhibition ability.

Defoamers are anything that can disrupt foam stability and can be used in defoamers, and the defoamer must be a liquid that spreads easily on the surface of the solution. When this liquid spreads on the surface of the solution, it will take away a layer of solution on the adjacent surface, causing the liquid film to be partially thinned, so that the liquid film will burst and the foam will be destroyed. In general, the faster the defoamer spreads on the surface of the solution, the thinner the liquid film becomes, and the critical thickness is quickly reached, the foam damage is accelerated, and the defoaming effect is strengthened.

Generally, the liquid that can spread on the surface and play a defoaming role has a low surface tension and is easy to adsorb on the surface of the solution, so that the local surface tension of the solution surface is reduced, and the imbalance phenomenon occurs, and the foam bursts. Defeng Defoamer Factory specializes in the production of defoamers for all walks of life.

A defoamer is a chemical used to eliminate air bubbles in liquids. Its function is to reduce the generation of foam, make the production process smoother, and improve product quality and production efficiency. Here are some of the roles and uses of defoamers:

Industrial production processes: Defoamers can be used in various industrial production processes, such as dairy products, fruit juices, brewing, chemicals, pharmaceuticals, etc. They can reduce the generation of foam, prevent foam accumulation, and improve the quality and production efficiency of products.

Food manufacturing process: Defoamers can be used in food manufacturing processes, such as ice cream, cakes, bread, etc. They can reduce the generation of foam and maintain the stability and taste of food.

Detergent manufacturing process: Defoamers can be used in detergent manufacturing processes, such as laundry detergent, dish soap, etc. They can reduce the generation of foam and improve the effectiveness and quality of detergents.

Water treatment process: Defoamers can be used in water treatment processes, such as seawater desalination, sewage treatment, etc. They can reduce the production of foam and prevent the pollution of water quality by foam.

Chemical production process: Defoamers can be used in chemical production processes, such as synthetic ammonia, methanol, etc. They can reduce the generation of foam and improve production efficiency and product quality.

In conclusion, defoamers have a wide range of applications in many production and application fields, which can effectively eliminate foam and improve product quality and production efficiency.

DefoamerThe function and use of water, solution, suspension, etcSurface tensionSubstances that prevent the formation of foam, or reduce or eliminate the original foam.

Defoamer is an additive that eliminates foam. In the production and application process of coatings, textiles, medicine, fermentation, papermaking, water treatment and petrochemical industries, a large amount of foam will be generated, which will affect product quality and production process. Based on the suppression and elimination of foam, a specific amount of defoamer is usually added to the production process.

The composition of the defoamer mainly includes active ingredients and emulsifiers.

carriers and emulsifying additives, in which the active ingredient is the most important core part, which plays a role in breaking foam and reducing surface tension; The emulsifier is to disperse the active ingredient into small particles so that it can be better dispersed into oil or water for a better defoaming effect; The carrier accounts for a large proportion of the defoamer, and its surface tension is not high, which mainly plays the role of a support medium, which is beneficial to the foam inhibition and defoaming effect, and can reduce the cost; Emulsifying aids are used to make the emulsification effect better.

The function of defoamer mainly includes three kinds of foaming, foam inhibition and defoaming, foaming refers to the addition of liquid foaming, through the action of adsorption bubble and surface tension into the bubble film to make the base thin, can quickly destroy the bubbles, reduce the liquid level; Foam inhibition is adsorbed on the bubble together with the liquid foaming substance, which reduces the surface tension and thins the bubble film, resulting in damage; Deaeration is adsorption in the bubble in the liquid, the air in the bubble is gathered, and after the bubbles are adsorbed with each other, a large bubble is formed when the adsorption interface is damaged, which accelerates the rising speed due to the increase of buoyancy and promotes the deaeration.

The main function of the defoamer is to defoam and inhibit foam and prevent secondary foaming.

Uses: Elimination of foam in various sewage treatment processes and process production processes.

Defoamers can reduce the surface tension of water, solutions, suspensions, etc., prevent the formation of foam, or reduce or eliminate the original foam.

Defoamers can be divided into liquid defoamers, solid defoamers and powder defoamers according to their forms, and the common ones are liquid defoamers.

According to the industry, it can be divided into water treatment defoamer, silicone defoamer, cutting fluid defoamer, oilfield defoamer, cleaning agent defoamer, daily chemical defoamer, fermentation defoamer and other industries of defoamer.

According to the performance, it can be divided into water-based defoamer, oil-based defoamer, acid-alkali resistant defoamer, high-temperature resistant defoamer, etc.

According to the composition, it can be divided into silicone defoamer, polyether defoamer, non-silicone defoamer, silicon polyether defoamer, mineral oil defoamer, silicone oil defoamer, etc.

The above lists several more common types of defoamers, generally speaking, the versatility of defoamers in the same industry is relatively strong, but there will be some differences, you can ask the technical staff when purchasing, and the problem can generally be solved.

Defoamer plant China Resources Chemical.

Commonly used defoamers are as follows:

According to the function, it is divided into:

1. Alkali-resistant defoamer.

It can quickly defoam and inhibit foam for a long time under high temperature and strong alkali conditions. Good stability, low dosage, high efficiency, no oil bleaching; It is widely used in papermaking cooking black liquor treatment, strong alkaline refining agent in textile printing and dyeing industry, cleaning agent under strong alkali conditions and other high temperature and strong alkali aqueous system defoaming.

2. Acid-resistant defoamer.

It is composed of fatty acid esters and fatty amides, and is widely used in wet phosphoric acid, titanium dioxide production, boric acid production and other strong acid systems.

3. High viscosity foam defoamer.

This product is a high-efficiency composite defoamer developed for the foam produced by papermaking pulp black liquor, chemical beneficiation and special chemical reactions, which has the characteristics of high viscosity, fine foam and difficult elimination.

4. Paint defoamer.

It contains a variety of high-quality defoaming ingredients, so it is widely applicable, and it is especially suitable for eliminating the foam of styrene acrylic latex, ethylene propylene latex, pure acrylic latex, vinyl acetate latex and other systems.

5. Papermaking defoamer.

It can effectively control pulp and foam overflow and improve the quality of papermaking. It is widely used in the defoaming of papermaking systems, and can also be used for defoaming of papermaking sewage treatment, antifreeze and distillation systems.

6. Cement mortar defoamer.

It can effectively control the foam generation in the cement mortar system, making the concrete components more dense and bright.

7. Oilfield industrial defoamer.

It can effectively control the production of foam in the oilfield industrial process and improve the efficiency of oil production.

8. Defoamer for cleaning.

It can effectively control the foaming of the cleaning agent.

9. Cationic system defoamer.

It can effectively control the production of foam containing cationic system, and is widely used in cationic rosin gum and cationic cleaning agent for papermaking, and can also be used for defoaming in papermaking sewage treatment, antifreeze and distillation systems.

10. High-efficiency fermentation defoamer.

It overcomes the shortcomings of ordinary silicone defoamer with poor high temperature resistance and short foam inhibition time; The foam accumulated in the fermentation tank can be eliminated as quickly as polyether, and this product has the advantages of time inhibition that polyether cannot match.

11. Water treatment defoamer.

Silicone defoamer has strong defoaming and antifoaming functions for water-based foaming systems, and is an ideal defoamer for water-based systems.

Hope that helps.

Defoamers, also known as foam inhibitors, have the following principles.

1) The surface tension of the foam part decreases, resulting in the bursting of the foam.

The origin of this mechanism is the dispersion of higher alcohols or vegetable oils onto the foam, which, when dissolved in the foam, significantly reduces the surface tension. Because these substances are generally insoluble in water, the reduction in surface tension is confined to the part of the foam, and the surface tension around the foam is almost constant. A part of the reduced surface tension is strongly stretched, extended, and finally ruptured.

2) Destroy the elasticity of the membrane and rupture the bubbles.

The addition of the defoamer to the foam system will diffuse to the gas-liquid interface, making the foam stabilization of the surfactant ineffective and the elasticity of the membrane difficult to restore.

3) Promote liquid film drainage.

Defoamers promote the drainage of the liquid film, causing bubbles to burst. The foam drain rate reflects the stability of the foam, and the addition of a substance to promote foam drainage can also have a defoaming effect.

4) The addition of hydrophobic solid particles will cause the bubbles to burst.

The hydrophobic solid particles on the surface of the bubble attract the hydrophobic end of the surfactant, so that the hydrophobic particles produce hydrophilicity and enter the aqueous phase to play a defoaming role.

5) Solubilizing foaming surfactants can cause bubble bursting.

Some low-molecular-weight substances that can mix well with the solution can solubilize the bubble surfactant and reduce its effective concentration. Low molecular substances such as octanol, ethanol and propanol can not only reduce the concentration of surfactants in the surface layer, but also dissolve the surfactant adsorption layer to reduce the intermolecular tightness of the surfactant, thereby reducing the stability of the foam.

6) Electrolyte disintegration surfactant electric double layer.

By interacting with the electric double layer of the foam's surfactant, a stable foaming solution can be formed. The addition of ordinary electrolytes can dissolve the double layer of surfactants to achieve defoaming effect.